Display panel or portion thereof with graphical user interface



FIG. 1 is a front view of a display panel or portion thereof with graphical user interface, showing our new design; and,

FIG. 2 is a front view of a second embodiment thereof.

The broken line depicting the display panel forms no part of the claimed design. 

CLAIM The ornamental design for a display panel or portion thereof with graphical user interface, substantially as shown and described. 